If you decide to go used, I've got a complete working sunroof from a 1992 400E W124. The brackets would be $56/pair which includes shipping in the contUSA.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon